Electricity

Question 1

What is used to convert AC to DC

Answer 1

A rectifier

Question 2

What is the frequency of the mains supply?

Answer 2

50Hz

Question 3

Equation that links charge, current and time?

Answer 3

I=Q/T

Question 4

What is current?

Answer 4

The rate of flow of electric charge

Question 5

Units of current (2)

Answer 5

Cs-1 , A

Question 6

Direction of the flow of current?

Answer 6

+ to -

Question 7

Direction of the flow of electrons in a circuit?

Answer 7

— to +

Question 8

What is a +ve metal plate called?

Answer 8

Anode

Question 9

What is a -ve metal plate called?

Answer 9

Cathode

Question 10

Does a voltmeter have high or low resistance?

Answer 10

High

Question 11

Does an ammeter have high or low resistance?

Answer 11

Low

Question 12

What is the equation linking voltage, current and resistance?

Answer 12

V=IR

Question 13

What is Ohm’s law?

Answer 13

Voltage is proportional to current

Question 14

What happens to a variable resistor as its temperature increases?

Answer 14

Its resistance decreases

Question 15

What happens to an LDR as its light intensity increases?

Answer 15

Its resistance decreases

Question 16

Equation linking voltage, energy and charge

Answer 16

V=E/Q

Question 17

Units of voltage (2)

Answer 17

JC-1 , V

Question 18

equation linking power, voltage and current?

Answer 18

P= IV

Question 19

equation linking power current and resistance?

Answer 19

P=I*2 R